( function () {
class RGBMLoader extends THREE.DataTextureLoader {
  loadCubemap(urls, onLoad, onProgress, onError) {
    const texture = new THREE.CubeTexture();
    let loaded = 0;
    const scope = this;

    function loadTexture(i) {
      scope.load(urls[i], function (image) {
        texture.images[i] = image;
        loaded++;

        if (loaded === 6) {
          texture.needsUpdate = true;
          if (onLoad) onLoad(texture);
        }
      }, undefined, onError);
    }

    for (let i = 0; i < urls.length; ++i) {
      loadTexture(i);
    }

    texture.encoding = THREE.RGBM7Encoding;
    texture.format = THREE.RGBAFormat;
    texture.minFilter = THREE.LinearFilter;
    texture.generateMipmaps = false;
    return texture;
  }

  parse(buffer) {
    const img = UPNG.decode(buffer);
    const rgba = UPNG.toRGBA8(img)[0];
    return {
      width: img.width,
      height: img.height,
      data: new Uint8Array(rgba),
      format: THREE.RGBAFormat,
      type: THREE.UnsignedByteType,
      flipY: true,
      encoding: THREE.RGBM7Encoding
    };
  }

} // from https://github.com/photopea/UPNG.js (MIT License)


var UPNG = {};

UPNG.toRGBA8 = function (out) {
  var w = out.width,
      h = out.height;
  if (out.tabs.acTL == null) return [UPNG.toRGBA8.decodeImage(out.data, w, h, out).buffer];
  var frms = [];
  if (out.frames[0].data == null) out.frames[0].data = out.data;
  var len = w * h * 4,
      img = new Uint8Array(len),
      empty = new Uint8Array(len),
      prev = new Uint8Array(len);

  for (var i = 0; i < out.frames.length; i++) {
    var frm = out.frames[i];
    var fx = frm.rect.x,
        fy = frm.rect.y,
        fw = frm.rect.width,
        fh = frm.rect.height;
    var fdata = UPNG.toRGBA8.decodeImage(frm.data, fw, fh, out);
    if (i != 0) for (var j = 0; j < len; j++) prev[j] = img[j];
    if (frm.blend == 0) UPNG._copyTile(fdata, fw, fh, img, w, h, fx, fy, 0);else if (frm.blend == 1) UPNG._copyTile(fdata, fw, fh, img, w, h, fx, fy, 1);
    frms.push(img.buffer.slice(0));

    if (frm.dispose == 0) {} else if (frm.dispose == 1) UPNG._copyTile(empty, fw, fh, img, w, h, fx, fy, 0);else if (frm.dispose == 2) for (var j = 0; j < len; j++) img[j] = prev[j];
  }

  return frms;
};

UPNG.toRGBA8.decodeImage = function (data, w, h, out) {
  var area = w * h,
      bpp = UPNG.decode._getBPP(out);

  var bpl = Math.ceil(w * bpp / 8); // bytes per line

  var bf = new Uint8Array(area * 4),
      bf32 = new Uint32Array(bf.buffer);
  var ctype = out.ctype,
      depth = out.depth;
  var rs = UPNG._bin.readUshort;

  if (ctype == 6) {
    // RGB + alpha
    var qarea = area << 2;
    if (depth == 8) for (var i = 0; i < qarea; i += 4) {
      bf[i] = data[i];
      bf[i + 1] = data[i + 1];
      bf[i + 2] = data[i + 2];
      bf[i + 3] = data[i + 3];
    }
    if (depth == 16) for (var i = 0; i < qarea; i++) {
      bf[i] = data[i << 1];
    }
  } else if (ctype == 2) {
    // RGB
    var ts = out.tabs['tRNS'];

    if (ts == null) {
      if (depth == 8) for (var i = 0; i < area; i++) {
        var ti = i * 3;
        bf32[i] = 255 << 24 | data[ti + 2] << 16 | data[ti + 1] << 8 | data[ti];
      }
      if (depth == 16) for (var i = 0; i < area; i++) {
        var ti = i * 6;
        bf32[i] = 255 << 24 | data[ti + 4] << 16 | data[ti + 2] << 8 | data[ti];
      }
    } else {
      var tr = ts[0],
          tg = ts[1],
          tb = ts[2];
      if (depth == 8) for (var i = 0; i < area; i++) {
        var qi = i << 2,
            ti = i * 3;
        bf32[i] = 255 << 24 | data[ti + 2] << 16 | data[ti + 1] << 8 | data[ti];
        if (data[ti] == tr && data[ti + 1] == tg && data[ti + 2] == tb) bf[qi + 3] = 0;
      }
      if (depth == 16) for (var i = 0; i < area; i++) {
        var qi = i << 2,
            ti = i * 6;
        bf32[i] = 255 << 24 | data[ti + 4] << 16 | data[ti + 2] << 8 | data[ti];
        if (rs(data, ti) == tr && rs(data, ti + 2) == tg && rs(data, ti + 4) == tb) bf[qi + 3] = 0;
      }
    }
  } else if (ctype == 3) {
    // palette
    var p = out.tabs['PLTE'],
        ap = out.tabs['tRNS'],
        tl = ap ? ap.length : 0; //console.log(p, ap);

    if (depth == 1) for (var y = 0; y < h; y++) {
      var s0 = y * bpl,
          t0 = y * w;

      for (var i = 0; i < w; i++) {
        var qi = t0 + i << 2,
            j = data[s0 + (i >> 3)] >> 7 - ((i & 7) << 0) & 1,
            cj = 3 * j;
        bf[qi] = p[cj];
        bf[qi + 1] = p[cj + 1];
        bf[qi + 2] = p[cj + 2];
        bf[qi + 3] = j < tl ? ap[j] : 255;
      }
    }
    if (depth == 2) for (var y = 0; y < h; y++) {
      var s0 = y * bpl,
          t0 = y * w;

      for (var i = 0; i < w; i++) {
        var qi = t0 + i << 2,
            j = data[s0 + (i >> 2)] >> 6 - ((i & 3) << 1) & 3,
            cj = 3 * j;
        bf[qi] = p[cj];
        bf[qi + 1] = p[cj + 1];
        bf[qi + 2] = p[cj + 2];
        bf[qi + 3] = j < tl ? ap[j] : 255;
      }
    }
    if (depth == 4) for (var y = 0; y < h; y++) {
      var s0 = y * bpl,
          t0 = y * w;

      for (var i = 0; i < w; i++) {
        var qi = t0 + i << 2,
            j = data[s0 + (i >> 1)] >> 4 - ((i & 1) << 2) & 15,
            cj = 3 * j;
        bf[qi] = p[cj];
        bf[qi + 1] = p[cj + 1];
        bf[qi + 2] = p[cj + 2];
        bf[qi + 3] = j < tl ? ap[j] : 255;
      }
    }
    if (depth == 8) for (var i = 0; i < area; i++) {
      var qi = i << 2,
          j = data[i],
          cj = 3 * j;
      bf[qi] = p[cj];
      bf[qi + 1] = p[cj + 1];
      bf[qi + 2] = p[cj + 2];
      bf[qi + 3] = j < tl ? ap[j] : 255;
    }
  } else if (ctype == 4) {
    // gray + alpha
    if (depth == 8) for (var i = 0; i < area; i++) {
      var qi = i << 2,
          di = i << 1,
          gr = data[di];
      bf[qi] = gr;
      bf[qi + 1] = gr;
      bf[qi + 2] = gr;
      bf[qi + 3] = data[di + 1];
    }
    if (depth == 16) for (var i = 0; i < area; i++) {
      var qi = i << 2,
          di = i << 2,
          gr = data[di];
      bf[qi] = gr;
      bf[qi + 1] = gr;
      bf[qi + 2] = gr;
      bf[qi + 3] = data[di + 2];
    }
  } else if (ctype == 0) {
    // gray
    var tr = out.tabs['tRNS'] ? out.tabs['tRNS'] : -1;

    for (var y = 0; y < h; y++) {
      var off = y * bpl,
          to = y * w;
      if (depth == 1) for (var x = 0; x < w; x++) {
        var gr = 255 * (data[off + (x >>> 3)] >>> 7 - (x & 7) & 1),
            al = gr == tr * 255 ? 0 : 255;
        bf32[to + x] = al << 24 | gr << 16 | gr << 8 | gr;
      } else if (depth == 2) for (var x = 0; x < w; x++) {
        var gr = 85 * (data[off + (x >>> 2)] >>> 6 - ((x & 3) << 1) & 3),
            al = gr == tr * 85 ? 0 : 255;
        bf32[to + x] = al << 24 | gr << 16 | gr << 8 | gr;
      } else if (depth == 4) for (var x = 0; x < w; x++) {
        var gr = 17 * (data[off + (x >>> 1)] >>> 4 - ((x & 1) << 2) & 15),
            al = gr == tr * 17 ? 0 : 255;
        bf32[to + x] = al << 24 | gr << 16 | gr << 8 | gr;
      } else if (depth == 8) for (var x = 0; x < w; x++) {
        var gr = data[off + x],
            al = gr == tr ? 0 : 255;
        bf32[to + x] = al << 24 | gr << 16 | gr << 8 | gr;
      } else if (depth == 16) for (var x = 0; x < w; x++) {
        var gr = data[off + (x << 1)],
            al = rs(data, off + (x << i)) == tr ? 0 : 255;
        bf32[to + x] = al << 24 | gr << 16 | gr << 8 | gr;
      }
    }
  } //console.log(Date.now()-time);


  return bf;
};

UPNG.decode = function (buff) {
  var data = new Uint8Array(buff),
      offset = 8,
      bin = UPNG._bin,
      rUs = bin.readUshort,
      rUi = bin.readUint;
  var out = {
    tabs: {},
    frames: []
  };
  var dd = new Uint8Array(data.length),
      doff = 0; // put all IDAT data into it

  var fd,
      foff = 0; // frames

  var mgck = [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a];

  for (var i = 0; i < 8; i++) if (data[i] != mgck[i]) throw 'The input is not a PNG file!';

  while (offset < data.length) {
    var len = bin.readUint(data, offset);
    offset += 4;
    var type = bin.readASCII(data, offset, 4);
    offset += 4; //console.log(type,len);

    if (type == 'IHDR') {
      UPNG.decode._IHDR(data, offset, out);
    } else if (type == 'CgBI') {
      out.tabs[type] = data.slice(offset, offset + 4);
    } else if (type == 'IDAT') {
      for (var i = 0; i < len; i++) dd[doff + i] = data[offset + i];

      doff += len;
    } else if (type == 'acTL') {
      out.tabs[type] = {
        num_frames: rUi(data, offset),
        num_plays: rUi(data, offset + 4)
      };
      fd = new Uint8Array(data.length);
    } else if (type == 'fcTL') {
      if (foff != 0) {
        var fr = out.frames[out.frames.length - 1];
        fr.data = UPNG.decode._decompress(out, fd.slice(0, foff), fr.rect.width, fr.rect.height);
        foff = 0;
      }

      var rct = {
        x: rUi(data, offset + 12),
        y: rUi(data, offset + 16),
        width: rUi(data, offset + 4),
        height: rUi(data, offset + 8)
      };
      var del = rUs(data, offset + 22);
      del = rUs(data, offset + 20) / (del == 0 ? 100 : del);
      var frm = {
        rect: rct,
        delay: Math.round(del * 1000),
        dispose: data[offset + 24],
        blend: data[offset + 25]
      }; //console.log(frm);

      out.frames.push(frm);
    } else if (type == 'fdAT') {
      for (var i = 0; i < len - 4; i++) fd[foff + i] = data[offset + i + 4];

      foff += len - 4;
    } else if (type == 'pHYs') {
      out.tabs[type] = [bin.readUint(data, offset), bin.readUint(data, offset + 4), data[offset + 8]];
    } else if (type == 'cHRM') {
      out.tabs[type] = [];

      for (var i = 0; i < 8; i++) out.tabs[type].push(bin.readUint(data, offset + i * 4));
    } else if (type == 'tEXt' || type == 'zTXt') {
      if (out.tabs[type] == null) out.tabs[type] = {};
      var nz = bin.nextZero(data, offset);
      var keyw = bin.readASCII(data, offset, nz - offset);
      var text,
          tl = offset + len - nz - 1;
      if (type == 'tEXt') text = bin.readASCII(data, nz + 1, tl);else {
        var bfr = UPNG.decode._inflate(data.slice(nz + 2, nz + 2 + tl));

        text = bin.readUTF8(bfr, 0, bfr.length);
      }
      out.tabs[type][keyw] = text;
    } else if (type == 'iTXt') {
      if (out.tabs[type] == null) out.tabs[type] = {};
      var nz = 0,
          off = offset;
      nz = bin.nextZero(data, off);
      var keyw = bin.readASCII(data, off, nz - off);
      off = nz + 1;
      var cflag = data[off];
      off += 2;
      nz = bin.nextZero(data, off);
      bin.readASCII(data, off, nz - off);
      off = nz + 1;
      nz = bin.nextZero(data, off);
      bin.readUTF8(data, off, nz - off);
      off = nz + 1;
      var text,
          tl = len - (off - offset);
      if (cflag == 0) text = bin.readUTF8(data, off, tl);else {
        var bfr = UPNG.decode._inflate(data.slice(off, off + tl));

        text = bin.readUTF8(bfr, 0, bfr.length);
      }
      out.tabs[type][keyw] = text;
    } else if (type == 'PLTE') {
      out.tabs[type] = bin.readBytes(data, offset, len);
    } else if (type == 'hIST') {
      var pl = out.tabs['PLTE'].length / 3;
      out.tabs[type] = [];

      for (var i = 0; i < pl; i++) out.tabs[type].push(rUs(data, offset + i * 2));
    } else if (type == 'tRNS') {
      if (out.ctype == 3) out.tabs[type] = bin.readBytes(data, offset, len);else if (out.ctype == 0) out.tabs[type] = rUs(data, offset);else if (out.ctype == 2) out.tabs[type] = [rUs(data, offset), rUs(data, offset + 2), rUs(data, offset + 4)]; //else console.log("tRNS for unsupported color type",out.ctype, len);
    } else if (type == 'gAMA') out.tabs[type] = bin.readUint(data, offset) / 100000;else if (type == 'sRGB') out.tabs[type] = data[offset];else if (type == 'bKGD') {
      if (out.ctype == 0 || out.ctype == 4) out.tabs[type] = [rUs(data, offset)];else if (out.ctype == 2 || out.ctype == 6) out.tabs[type] = [rUs(data, offset), rUs(data, offset + 2), rUs(data, offset + 4)];else if (out.ctype == 3) out.tabs[type] = data[offset];
    } else if (type == 'IEND') {
      break;
    } //else {  log("unknown chunk type", type, len);  }


    offset += len;
    bin.readUint(data, offset);
    offset += 4;
  }

  if (foff != 0) {
    var fr = out.frames[out.frames.length - 1];
    fr.data = UPNG.decode._decompress(out, fd.slice(0, foff), fr.rect.width, fr.rect.height);
    foff = 0;
  }

  out.data = UPNG.decode._decompress(out, dd, out.width, out.height);
  delete out.compress;
  delete out.interlace;
  delete out.filter;
  return out;
};

UPNG.decode._decompress = function (out, dd, w, h) {
  var bpp = UPNG.decode._getBPP(out),
      bpl = Math.ceil(w * bpp / 8),
      buff = new Uint8Array((bpl + 1 + out.interlace) * h);

  if (out.tabs['CgBI']) dd = UPNG.inflateRaw(dd, buff);else dd = UPNG.decode._inflate(dd, buff);
  if (out.interlace == 0) dd = UPNG.decode._filterZero(dd, out, 0, w, h);else if (out.interlace == 1) dd = UPNG.decode._readInterlace(dd, out);
  return dd;
};

UPNG.decode._inflate = function (data, buff) {
  var out = UPNG['inflateRaw'](new Uint8Array(data.buffer, 2, data.length - 6), buff);
  return out;
};

UPNG.inflateRaw = function () {
  var H = {};
  H.H = {};

  H.H.N = function (N, W) {
    var R = Uint8Array,
        i = 0,
        m = 0,
        J = 0,
        h = 0,
        Q = 0,
        X = 0,
        u = 0,
        w = 0,
        d = 0,
        v,
        C;
    if (N[0] == 3 && N[1] == 0) return W ? W : new R(0);
    var V = H.H,
        n = V.b,
        A = V.e,
        l = V.R,
        M = V.n,
        I = V.A,
        e = V.Z,
        b = V.m,
        Z = W == null;
    if (Z) W = new R(N.length >>> 2 << 5);

    while (i == 0) {
      i = n(N, d, 1);
      m = n(N, d + 1, 2);
      d += 3;

      if (m == 0) {
        if ((d & 7) != 0) d += 8 - (d & 7);
        var D = (d >>> 3) + 4,
            q = N[D - 4] | N[D - 3] << 8;
        if (Z) W = H.H.W(W, w + q);
        W.set(new R(N.buffer, N.byteOffset + D, q), w);
        d = D + q << 3;
        w += q;
        continue;
      }

      if (Z) W = H.H.W(W, w + (1 << 17));

      if (m == 1) {
        v = b.J;
        C = b.h;
        X = (1 << 9) - 1;
        u = (1 << 5) - 1;
      }

      if (m == 2) {
        J = A(N, d, 5) + 257;
        h = A(N, d + 5, 5) + 1;
        Q = A(N, d + 10, 4) + 4;
        d += 14;
        var j = 1;

        for (var c = 0; c < 38; c += 2) {
          b.Q[c] = 0;
          b.Q[c + 1] = 0;
        }

        for (var c = 0; c < Q; c++) {
          var K = A(N, d + c * 3, 3);
          b.Q[(b.X[c] << 1) + 1] = K;
          if (K > j) j = K;
        }

        d += 3 * Q;
        M(b.Q, j);
        I(b.Q, j, b.u);
        v = b.w;
        C = b.d;
        d = l(b.u, (1 << j) - 1, J + h, N, d, b.v);
        var r = V.V(b.v, 0, J, b.C);
        X = (1 << r) - 1;
        var S = V.V(b.v, J, h, b.D);
        u = (1 << S) - 1;
        M(b.C, r);
        I(b.C, r, v);
        M(b.D, S);
        I(b.D, S, C);
      }

      while (!0) {
        var T = v[e(N, d) & X];
        d += T & 15;
        var p = T >>> 4;

        if (p >>> 8 == 0) {
          W[w++] = p;
        } else if (p == 256) {
          break;
        } else {
          var z = w + p - 254;

          if (p > 264) {
            var _ = b.q[p - 257];
            z = w + (_ >>> 3) + A(N, d, _ & 7);
            d += _ & 7;
          }

          var $ = C[e(N, d) & u];
          d += $ & 15;
          var s = $ >>> 4,
              Y = b.c[s],
              a = (Y >>> 4) + n(N, d, Y & 15);
          d += Y & 15;

          while (w < z) {
            W[w] = W[w++ - a];
            W[w] = W[w++ - a];
            W[w] = W[w++ - a];
            W[w] = W[w++ - a];
          }

          w = z;
        }
      }
    }

    return W.length == w ? W : W.slice(0, w);
  };

  H.H.W = function (N, W) {
    var R = N.length;
    if (W <= R) return N;
    var V = new Uint8Array(R << 1);
    V.set(N, 0);
    return V;
  };

  H.H.R = function (N, W, R, V, n, A) {
    var l = H.H.e,
        M = H.H.Z,
        I = 0;

    while (I < R) {
      var e = N[M(V, n) & W];
      n += e & 15;
      var b = e >>> 4;

      if (b <= 15) {
        A[I] = b;
        I++;
      } else {
        var Z = 0,
            m = 0;

        if (b == 16) {
          m = 3 + l(V, n, 2);
          n += 2;
          Z = A[I - 1];
        } else if (b == 17) {
          m = 3 + l(V, n, 3);
          n += 3;
        } else if (b == 18) {
          m = 11 + l(V, n, 7);
          n += 7;
        }

        var J = I + m;

        while (I < J) {
          A[I] = Z;
          I++;
        }
      }
    }

    return n;
  };

  H.H.V = function (N, W, R, V) {
    var n = 0,
        A = 0,
        l = V.length >>> 1;

    while (A < R) {
      var M = N[A + W];
      V[A << 1] = 0;
      V[(A << 1) + 1] = M;
      if (M > n) n = M;
      A++;
    }

    while (A < l) {
      V[A << 1] = 0;
      V[(A << 1) + 1] = 0;
      A++;
    }

    return n;
  };

  H.H.n = function (N, W) {
    var R = H.H.m,
        V = N.length,
        n,
        A,
        l,
        M,
        I,
        e = R.j;

    for (var M = 0; M <= W; M++) e[M] = 0;

    for (M = 1; M < V; M += 2) e[N[M]]++;

    var b = R.K;
    n = 0;
    e[0] = 0;

    for (A = 1; A <= W; A++) {
      n = n + e[A - 1] << 1;
      b[A] = n;
    }

    for (l = 0; l < V; l += 2) {
      I = N[l + 1];

      if (I != 0) {
        N[l] = b[I];
        b[I]++;
      }
    }
  };

  H.H.A = function (N, W, R) {
    var V = N.length,
        n = H.H.m,
        A = n.r;

    for (var l = 0; l < V; l += 2) if (N[l + 1] != 0) {
      var M = l >> 1,
          I = N[l + 1],
          e = M << 4 | I,
          b = W - I,
          Z = N[l] << b,
          m = Z + (1 << b);

      while (Z != m) {
        var J = A[Z] >>> 15 - W;
        R[J] = e;
        Z++;
      }
    }
  };

  H.H.l = function (N, W) {
    var R = H.H.m.r,
        V = 15 - W;

    for (var n = 0; n < N.length; n += 2) {
      var A = N[n] << W - N[n + 1];
      N[n] = R[A] >>> V;
    }
  };

  H.H.M = function (N, W, R) {
    R = R << (W & 7);
    var V = W >>> 3;
    N[V] |= R;
    N[V + 1] |= R >>> 8;
  };

  H.H.I = function (N, W, R) {
    R = R << (W & 7);
    var V = W >>> 3;
    N[V] |= R;
    N[V + 1] |= R >>> 8;
    N[V + 2] |= R >>> 16;
  };

  H.H.e = function (N, W, R) {
    return (N[W >>> 3] | N[(W >>> 3) + 1] << 8) >>> (W & 7) & (1 << R) - 1;
  };

  H.H.b = function (N, W, R) {
    return (N[W >>> 3] | N[(W >>> 3) + 1] << 8 | N[(W >>> 3) + 2] << 16) >>> (W & 7) & (1 << R) - 1;
  };

  H.H.Z = function (N, W) {
    return (N[W >>> 3] | N[(W >>> 3) + 1] << 8 | N[(W >>> 3) + 2] << 16) >>> (W & 7);
  };

  H.H.i = function (N, W) {
    return (N[W >>> 3] | N[(W >>> 3) + 1] << 8 | N[(W >>> 3) + 2] << 16 | N[(W >>> 3) + 3] << 24) >>> (W & 7);
  };

  H.H.m = function () {
    var N = Uint16Array,
        W = Uint32Array;
    return {
      K: new N(16),
      j: new N(16),
      X: [16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15],
      S: [3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 999, 999, 999],
      T: [0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 0, 0, 0],
      q: new N(32),
      p: [1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577, 65535, 65535],
      z: [0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 0, 0],
      c: new W(32),
      J: new N(512),
      _: [],
      h: new N(32),
      $: [],
      w: new N(32768),
      C: [],
      v: [],
      d: new N(32768),
      D: [],
      u: new N(512),
      Q: [],
      r: new N(1 << 15),
      s: new W(286),
      Y: new W(30),
      a: new W(19),
      t: new W(15e3),
      k: new N(1 << 16),
      g: new N(1 << 15)
    };
  }();

  (function () {
    var N = H.H.m,
        W = 1 << 15;

    for (var R = 0; R < W; R++) {
      var V = R;
      V = (V & 2863311530) >>> 1 | (V & 1431655765) << 1;
      V = (V & 3435973836) >>> 2 | (V & 858993459) << 2;
      V = (V & 4042322160) >>> 4 | (V & 252645135) << 4;
      V = (V & 4278255360) >>> 8 | (V & 16711935) << 8;
      N.r[R] = (V >>> 16 | V << 16) >>> 17;
    }

    function n(A, l, M) {
      while (l-- != 0) A.push(0, M);
    }

    for (var R = 0; R < 32; R++) {
      N.q[R] = N.S[R] << 3 | N.T[R];
      N.c[R] = N.p[R] << 4 | N.z[R];
    }

    n(N._, 144, 8);
    n(N._, 255 - 143, 9);
    n(N._, 279 - 255, 7);
    n(N._, 287 - 279, 8);
    H.H.n(N._, 9);
    H.H.A(N._, 9, N.J);
    H.H.l(N._, 9);
    n(N.$, 32, 5);
    H.H.n(N.$, 5);
    H.H.A(N.$, 5, N.h);
    H.H.l(N.$, 5);
    n(N.Q, 19, 0);
    n(N.C, 286, 0);
    n(N.D, 30, 0);
    n(N.v, 320, 0);
  })();

  return H.H.N;
}();

UPNG.decode._readInterlace = function (data, out) {
  var w = out.width,
      h = out.height;

  var bpp = UPNG.decode._getBPP(out),
      cbpp = bpp >> 3,
      bpl = Math.ceil(w * bpp / 8);

  var img = new Uint8Array(h * bpl);
  var di = 0;
  var starting_row = [0, 0, 4, 0, 2, 0, 1];
  var starting_col = [0, 4, 0, 2, 0, 1, 0];
  var row_increment = [8, 8, 8, 4, 4, 2, 2];
  var col_increment = [8, 8, 4, 4, 2, 2, 1];
  var pass = 0;

  while (pass < 7) {
    var ri = row_increment[pass],
        ci = col_increment[pass];
    var sw = 0,
        sh = 0;
    var cr = starting_row[pass];

    while (cr < h) {
      cr += ri;
      sh++;
    }

    var cc = starting_col[pass];

    while (cc < w) {
      cc += ci;
      sw++;
    }

    var bpll = Math.ceil(sw * bpp / 8);

    UPNG.decode._filterZero(data, out, di, sw, sh);

    var y = 0,
        row = starting_row[pass];

    while (row < h) {
      var col = starting_col[pass];
      var cdi = di + y * bpll << 3;

      while (col < w) {
        if (bpp == 1) {
          var val = data[cdi >> 3];
          val = val >> 7 - (cdi & 7) & 1;
          img[row * bpl + (col >> 3)] |= val << 7 - ((col & 7) << 0);
        }

        if (bpp == 2) {
          var val = data[cdi >> 3];
          val = val >> 6 - (cdi & 7) & 3;
          img[row * bpl + (col >> 2)] |= val << 6 - ((col & 3) << 1);
        }

        if (bpp == 4) {
          var val = data[cdi >> 3];
          val = val >> 4 - (cdi & 7) & 15;
          img[row * bpl + (col >> 1)] |= val << 4 - ((col & 1) << 2);
        }

        if (bpp >= 8) {
          var ii = row * bpl + col * cbpp;

          for (var j = 0; j < cbpp; j++) img[ii + j] = data[(cdi >> 3) + j];
        }

        cdi += bpp;
        col += ci;
      }

      y++;
      row += ri;
    }

    if (sw * sh != 0) di += sh * (1 + bpll);
    pass = pass + 1;
  }

  return img;
};

UPNG.decode._getBPP = function (out) {
  var noc = [1, null, 3, 1, 2, null, 4][out.ctype];
  return noc * out.depth;
};

UPNG.decode._filterZero = function (data, out, off, w, h) {
  var bpp = UPNG.decode._getBPP(out),
      bpl = Math.ceil(w * bpp / 8),
      paeth = UPNG.decode._paeth;

  bpp = Math.ceil(bpp / 8);
  var i = 0,
      di = 1,
      type = data[off],
      x = 0;
  if (type > 1) data[off] = [0, 0, 1][type - 2];
  if (type == 3) for (x = bpp; x < bpl; x++) data[x + 1] = data[x + 1] + (data[x + 1 - bpp] >>> 1) & 255;

  for (var y = 0; y < h; y++) {
    i = off + y * bpl;
    di = i + y + 1;
    type = data[di - 1];
    x = 0;
    if (type == 0) for (; x < bpl; x++) data[i + x] = data[di + x];else if (type == 1) {
      for (; x < bpp; x++) data[i + x] = data[di + x];

      for (; x < bpl; x++) data[i + x] = data[di + x] + data[i + x - bpp];
    } else if (type == 2) {
      for (; x < bpl; x++) data[i + x] = data[di + x] + data[i + x - bpl];
    } else if (type == 3) {
      for (; x < bpp; x++) data[i + x] = data[di + x] + (data[i + x - bpl] >>> 1);

      for (; x < bpl; x++) data[i + x] = data[di + x] + (data[i + x - bpl] + data[i + x - bpp] >>> 1);
    } else {
      for (; x < bpp; x++) data[i + x] = data[di + x] + paeth(0, data[i + x - bpl], 0);

      for (; x < bpl; x++) data[i + x] = data[di + x] + paeth(data[i + x - bpp], data[i + x - bpl], data[i + x - bpp - bpl]);
    }
  }

  return data;
};

UPNG.decode._paeth = function (a, b, c) {
  var p = a + b - c,
      pa = p - a,
      pb = p - b,
      pc = p - c;
  if (pa * pa <= pb * pb && pa * pa <= pc * pc) return a;else if (pb * pb <= pc * pc) return b;
  return c;
};

UPNG.decode._IHDR = function (data, offset, out) {
  var bin = UPNG._bin;
  out.width = bin.readUint(data, offset);
  offset += 4;
  out.height = bin.readUint(data, offset);
  offset += 4;
  out.depth = data[offset];
  offset++;
  out.ctype = data[offset];
  offset++;
  out.compress = data[offset];
  offset++;
  out.filter = data[offset];
  offset++;
  out.interlace = data[offset];
  offset++;
};

UPNG._bin = {
  nextZero: function (data, p) {
    while (data[p] != 0) p++;

    return p;
  },
  readUshort: function (buff, p) {
    return buff[p] << 8 | buff[p + 1];
  },
  writeUshort: function (buff, p, n) {
    buff[p] = n >> 8 & 255;
    buff[p + 1] = n & 255;
  },
  readUint: function (buff, p) {
    return buff[p] * (256 * 256 * 256) + (buff[p + 1] << 16 | buff[p + 2] << 8 | buff[p + 3]);
  },
  writeUint: function (buff, p, n) {
    buff[p] = n >> 24 & 255;
    buff[p + 1] = n >> 16 & 255;
    buff[p + 2] = n >> 8 & 255;
    buff[p + 3] = n & 255;
  },
  readASCII: function (buff, p, l) {
    var s = '';

    for (var i = 0; i < l; i++) s += String.fromCharCode(buff[p + i]);

    return s;
  },
  writeASCII: function (data, p, s) {
    for (var i = 0; i < s.length; i++) data[p + i] = s.charCodeAt(i);
  },
  readBytes: function (buff, p, l) {
    var arr = [];

    for (var i = 0; i < l; i++) arr.push(buff[p + i]);

    return arr;
  },
  pad: function (n) {
    return n.length < 2 ? '0' + n : n;
  },
  readUTF8: function (buff, p, l) {
    var s = '',
        ns;

    for (var i = 0; i < l; i++) s += '%' + UPNG._bin.pad(buff[p + i].toString(16));

    try {
      ns = decodeURIComponent(s);
    } catch (e) {
      return UPNG._bin.readASCII(buff, p, l);
    }

    return ns;
  }
};

UPNG._copyTile = function (sb, sw, sh, tb, tw, th, xoff, yoff, mode) {
  var w = Math.min(sw, tw),
      h = Math.min(sh, th);
  var si = 0,
      ti = 0;

  for (var y = 0; y < h; y++) for (var x = 0; x < w; x++) {
    if (xoff >= 0 && yoff >= 0) {
      si = y * sw + x << 2;
      ti = (yoff + y) * tw + xoff + x << 2;
    } else {
      si = (-yoff + y) * sw - xoff + x << 2;
      ti = y * tw + x << 2;
    }

    if (mode == 0) {
      tb[ti] = sb[si];
      tb[ti + 1] = sb[si + 1];
      tb[ti + 2] = sb[si + 2];
      tb[ti + 3] = sb[si + 3];
    } else if (mode == 1) {
      var fa = sb[si + 3] * (1 / 255),
          fr = sb[si] * fa,
          fg = sb[si + 1] * fa,
          fb = sb[si + 2] * fa;
      var ba = tb[ti + 3] * (1 / 255),
          br = tb[ti] * ba,
          bg = tb[ti + 1] * ba,
          bb = tb[ti + 2] * ba;
      var ifa = 1 - fa,
          oa = fa + ba * ifa,
          ioa = oa == 0 ? 0 : 1 / oa;
      tb[ti + 3] = 255 * oa;
      tb[ti + 0] = (fr + br * ifa) * ioa;
      tb[ti + 1] = (fg + bg * ifa) * ioa;
      tb[ti + 2] = (fb + bb * ifa) * ioa;
    } else if (mode == 2) {
      // copy only differences, otherwise zero
      var fa = sb[si + 3],
          fr = sb[si],
          fg = sb[si + 1],
          fb = sb[si + 2];
      var ba = tb[ti + 3],
          br = tb[ti],
          bg = tb[ti + 1],
          bb = tb[ti + 2];

      if (fa == ba && fr == br && fg == bg && fb == bb) {
        tb[ti] = 0;
        tb[ti + 1] = 0;
        tb[ti + 2] = 0;
        tb[ti + 3] = 0;
      } else {
        tb[ti] = fr;
        tb[ti + 1] = fg;
        tb[ti + 2] = fb;
        tb[ti + 3] = fa;
      }
    } else if (mode == 3) {
      // check if can be blended
      var fa = sb[si + 3],
          fr = sb[si],
          fg = sb[si + 1],
          fb = sb[si + 2];
      var ba = tb[ti + 3],
          br = tb[ti],
          bg = tb[ti + 1],
          bb = tb[ti + 2];
      if (fa == ba && fr == br && fg == bg && fb == bb) continue; //if(fa!=255 && ba!=0) return false;

      if (fa < 220 && ba > 20) return false;
    }
  }

  return true;
};

THREE.RGBMLoader = RGBMLoader;
} )();
